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And, to effect this, the hours in question must be noted, and it must first be observed, by the right ascensions again, how many equatorial times the succeeding degree, at its original position, is distant from the degree on the mid-heaven; and then it must be seen how many equatorial times it will be distant, on coming to the preceding degree’s distance in temporal hours from the said mid-heaven: this will be found, by multiplying those hours by the succeeding degree’s horary times; diurnal, if the future position be above the earth, and nocturnal if under; and the difference in amount, of these two distances, in equatorial times, will present the number of years inquired for.